March 28, 2020 Dr. Shiva Ayyadurai Scientist Dr. Shiva Ayyadurai give you a systems analysis of Vitamin D and its biological effects on the immune system. You do not have access to this content. Kindly register or upgrade your Plan. Register / Upgrade Username or E-mail Password Remember Me Forgot Password Share This Facebook Instagram LinkedIn Youtube Telegram Bitchute Rumble Gab Minds Odysee Gettr